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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0044 Advisory (icsa-21-005-06) Delta Electronics CNCSoft ScreenEditor 6 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Delta Electronics CNCSoft ScreenEditor Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-27281 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-005-06 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-005-06) Delta Electronics CNCSoft ScreenEditor Original release date: January 05, 2021 Legal Notice All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.8 o ATTENTION: Low skill level to exploit o Vendor: Delta Electronics o Equipment: CNCSoft ScreenEditor o Vulnerability: Stack-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of this vulnerability may allow arbitrary code execution. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of CNCSoft ScreenEditor, an HMI, are affected: o CNCSoft ScreenEditor Versions 1.01.26 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 A stack-based buffer overflow may exist when processing specially crafted project files, which may allow an attacker to execute arbitrary code. CVE-2020-27281 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/C:H/ I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Taiwan 3.4 RESEARCHER Kimiya, working with Trend Micro Zero's Day Initiative, reported this vulnerability to CISA. 4. MITIGATIONS Delta Electronics has released an updated version of CNCSoft ScreenEditor, and recommends users install update v1.0.1.28 on all affected systems. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov . Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies . Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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